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annotate Lib/IMPL/declare.pm @ 280:c6d0f889ef87

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+IMPL::declare now supports meta attributes *bugfixes related to the typeof() operator
author cin
date Wed, 06 Feb 2013 02:15:48 +0400
parents af8af4b8337e
children a8dbddf491dd
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1 package IMPL::declare;
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2 use strict;
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3
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4 use Scalar::Util qw(set_prototype);
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5 use Carp qw(carp);
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6 use IMPL::Class::PropertyInfo();
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7 use IMPL::Const qw(:access);
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8 use IMPL::require();
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9
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10 BEGIN {
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11 *_require = *IMPL::require::_require;
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12 *_trace = *IMPL::require::_trace;
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13 }
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14
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15 sub import {
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16 my ( $self, $args ) = @_;
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17
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18 return unless $args;
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19
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20 die "A hash reference is required" unless ref $args eq 'HASH';
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21
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22 no strict 'refs';
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23 no warnings 'once';
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24
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25 my $caller = caller;
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26
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27 my $aliases = $args->{require} || {};
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28
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29 $IMPL::require::PENDING{$caller} = 1;
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30 _trace("declare $caller");
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31 $IMPL::require::level++;
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32
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33 while ( my ( $alias, $class ) = each %$aliases ) {
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34 _trace("$alias => $class");
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35 $IMPL::require::level ++;
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36 my $c = _require($class);
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37
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38 *{"${caller}::$alias"} = set_prototype(
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39 sub {
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40 $c;
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41 },
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42 ''
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43 );
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44 $IMPL::require::level --;
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45 }
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46
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47 my $base = $args->{base} || {};
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48
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49 my %ctor;
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50 my @isa;
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51
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52 if ( ref $base eq 'ARRAY' ) {
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53 carp "Odd elements number in require"
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54 unless scalar(@$base) % 2 == 0;
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55 while ( my ( $class, $mapper ) = splice @$base, 0, 2 ) {
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56 _trace("parent $class");
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57 $IMPL::require::level ++;
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58 $class = $aliases->{$class} || _require($class);
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59 $IMPL::require::level --;
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60
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61 push @isa, $class;
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62 $ctor{$class} = $mapper;
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63 }
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64 }
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65 elsif ( ref $base eq 'HASH' ) {
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66 while ( my ( $class, $mapper ) = each %$base ) {
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67 _trace("parent $class");
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68 $IMPL::require::level ++;
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69 $class = $aliases->{$class} || _require($class);
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70 $IMPL::require::level --;
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71
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72 push @isa, $class;
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73 $ctor{$class} = $mapper;
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74 }
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75 }
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76
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77 %{"${caller}::CTOR"} = %ctor;
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78 push @{"${caller}::ISA"}, @isa;
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79
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80 if(ref($args->{meta}) eq 'ARRAY') {
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81 $caller->SetMeta($_) foreach @{$args->{meta}};
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82 }
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83
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84 my $props = $args->{props} || [];
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85
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86 if ( $props eq 'HASH' ) {
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87 $props = [%$props];
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88 }
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89
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90 die "A hash or an array reference is required in the properties list"
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91 unless ref $props eq 'ARRAY';
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92
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93 carp "Odd elements number in properties declaration of $caller"
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94 unless scalar(@$props) % 2 == 0;
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95
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96 if (@$props) {
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97 $self->_implementProps($props,$caller);
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98 }
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99
256
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100 if ($args->{_implement}) {
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101 $self->_implementProps($caller->abstractProps,$caller);
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102 }
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103
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104 $IMPL::require::level--;
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105 delete $IMPL::require::PENDING{$caller};
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106 }
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107
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108 sub _implementProps {
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109 my ($self, $props, $caller) = @_;
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110
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111 for ( my $i = 0 ; $i < @$props - 1 ; $i = $i + 2 ) {
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112 my ( $prop, $spec ) = @{$props}[ $i, $i + 1 ];
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113
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114 $caller->ClassPropertyImplementor->Implement(
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115 $spec,
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116 {
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117 name => $prop,
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118 class => $caller,
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119 access => $prop =~ /^_/
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120 ? ACCESS_PRIVATE
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121 : ACCESS_PUBLIC
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122 }
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123 );
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124 }
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125 }
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126
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127 1;
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128
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129 __END__
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130
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131 =pod
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132
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133 =head1 NAME
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134
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135 C<IMPL::declare> - описывает класс
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136
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137 =head1 SYNOPSIS
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138
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139 =begin code
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140
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141 package My::Bar;
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142
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143 use IMPL::declare {
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144 require => {
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145 TFoo => 'My::Foo',
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146 TBox => 'My::Box'
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147 },
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148 base => {
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149 TFoo => '@_',
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150 'IMPL::Object' => undef,
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151 }
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152 }
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153
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154 sub CreateBox {
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155 my ($this) = @_;
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156 return TBox->new($this);
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157 }
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158
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159 =end code
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160
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161 Специальная ситрока C<@_> означает передачу параметров конструктора текущего класса конструктору
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162 базового класса без изменений.
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163
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164 =head1 DESCRIPTION
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165
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166 Описывает текущий пакет(модуль) как класс. В качестве параметра получает ссылку на хеш,
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167 в которой храняться метаданные для объявления класса.
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168
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169 =head1 METADATA
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170
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171 =head2 C<require>
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172
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173 Содержит ссылку на хеш с синонимами модулей, которые будут доступны в текушем модуле,
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174 аналогично использованию C<IMPL::require>. Однако, если модуль не требует загрузки при
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175 помощи C<require> нужно использовать префикс C<'-'> в его имени
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176
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177 =begin code
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178
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179 {
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180 require => {
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181 TObject => 'IMPL::Object', # will be loaded with require
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182 TFoo => '-My:App::Data::Foo' # will not use 'require' to load module
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183 }
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184 }
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185
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186 =end code
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187
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188 =head2 C<base>
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189
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190 Обисывает базове классы для текущего класса. Если данный параметр - ссылка массив, то
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191 этот массив будет превращен в массив C<@ISA>. Если данный параметр - ссылка на хеш, то
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192 его ключи опичавют список базовых классов, а значения - преобразование параметров для
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193 вызова базовых конструкторов.
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194
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195 В качестве имен базовых классов могут быть как полные имена модулей, так и назначенные
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196 ранее псевдонимы. Использование префикса C<'-'> перед B<полным именем модуля> означает,
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197 что модуль не требуется загружать, в случае с псевдонимами, префикс C<'-'> уже был указан
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198 при их объявлении.
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199
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200 =begin code
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201
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202 {
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203 require => {
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204 TFoo => '-My:App::Data::Foo' # will not use 'require' to load module
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205 },
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206 base => {
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207 TFoo => '@_', # pass parameters unchanged
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208 'My::Base::Class' => sub { name => $_[0], data => $_[1] }, # remap parameters
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209 '-My::Extentions' => undef, # do not pass any parameters
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210 }
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211 }
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212
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213 =end code
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214
228
431db7034a88 Для синхронизации
andrei <andrei@nap21.upri>
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215 =cut